Oscillators – Relaxation oscillators
Patent
1988-09-01
1989-07-11
Haroian, Harry N.
Oscillators
Relaxation oscillators
G01C 1234
Patent
active
048458538
ABSTRACT:
A sundial which is characterized by a selectively portable or permanent base and support bracket combination, which support bracket facilitates an angular movement for effecting latitude adjustment to the sun's path and includes a support bracket plate, a middle plate pivotally connected to the support bracket plate and a connecting plate pivotally attached to the middle plate, with a pair of semi-cylindrical dials secured to the connecting plate in oppositely-disposed relationship. Analemma adjustment for coordinating sundial time with "clock" time is facilitated by an adjustment lever which is pivotally attached to the connecting plate and the middle plate and is adjusted with respect to an analemma path inscribed on the connecting plate. Daylight savings time adjustment is also facilitated by pivoting the middle plate with respect to the support bracket plate and this adjustment also allows correction for location of the sundial within the time zone. A pair of gnomons are suspended outwardly of the concave dial curvatures, respectively, for casting a shadow on the dials and indicating the time of day and day of the year responsive to rotation of the earth and transversal of the shadow across the dials. Each gnomon is spherical in shape and is suspended in the center of a diameter of each of the dials and the connecting plate and dials are oriented at a selected angle with respect to the base, which angle is determined by the latitude at which the sundial is positioned. Each of the dials is further provided with hour and month markings to facilitate direct reading of the time of day and the approximate day of the month responsive to the sequential casting of the shadow by the gnomons.
REFERENCES:
patent: 303118 (1984-08-01), Christian
patent: 4102054 (1978-07-01), Lewis
patent: 4355470 (1980-10-01), Doyle
Haroian Harry N.
Harrison John M.
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